Mouthpiece for extruder and extruder

Abstract

Provided is a mouthpiece for an extruder provided at an extruder extruding a flowable molding material, including: a molding material flow passage; a molding material extrusion port formed at a front end of the molding material flow passage; and one or plural flow resistance members provided to advance into and withdraw from the molding material flow passage, the advancing and the withdrawing being performed by an operation at the outside of the mouthpiece for the extruder.

What is claimed is: 
     
         1 . A mouthpiece for an extruder provided at an extruder extruding a flowable molding material, comprising:
 a molding material flow passage;   a molding material extrusion port formed at a front end of the molding material flow passage; and   one or plural flow resistance members provided to advance into and withdraw from the molding material flow passage, the advancing and the withdrawing being performed by an operation at the outside of the mouthpiece for the extruder.   
     
     
         2 . The mouthpiece for the extruder according to  claim 1 ,
 wherein a cross-section in a direction orthogonal to a flow direction of the flow passage has an elongated hole shape and the flow resistance members are arranged on any one of opposite close surfaces of the flow passage.   
     
     
         3 . The mouthpiece for the extruder according to  claim 1 , further comprising:
 a main body provided with the flow resistance members; and   a separate body provided at an end of the main body in an extrusion direction,   wherein the separate body is provided with the molding material extrusion port having a final profile shape.   
     
     
         4 . An extruder comprising:
 the mouthpiece for the extruder according to  claim 1 .